Index: src/wp-includes/post.php
===================================================================
--- src/wp-includes/post.php	(revision 27841)
+++ src/wp-includes/post.php	(working copy)
@@ -2826,6 +2826,9 @@
 		else
 			$post_date_gmt = '0000-00-00 00:00:00';
 	}
+    elseif ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
+        $post_date_gmt = '0000-00-00 00:00:00';
+    }
 
 	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
 		$post_modified     = current_time( 'mysql' );